fix: remove stale stitcher reference from catalog test

The stitcher parameter was removed from DefaultEntitiesCatalog's
constructor by the stitching refactor, but two tests added by the
query split PR still referenced it.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Fredrik Adelöw <freben@gmail.com>

plugins/catalog-backend/src/service/DefaultEntitiesCatalog.test.ts

@@ -2190,7 +2190,6 @@ describe.each(databases.eachSupportedId())(
         const catalog = new DefaultEntitiesCatalog({
           database: knex,
           logger: mockServices.logger.mock(),
-          stitcher,
         });
 
         const filter = { key: 'spec.should_include_this' };
@@ -2252,7 +2251,6 @@ describe.each(databases.eachSupportedId())(
         const catalog = new DefaultEntitiesCatalog({
           database: knex,
           logger: mockServices.logger.mock(),
-          stitcher,
         });
 
         const response = await catalog.queryEntities({